bugfix: read/write fd dropped unexpectedly.#184
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WeiZhang555 merged 1 commit intocloud-hypervisor:masterfrom Feb 5, 2024
Merged
bugfix: read/write fd dropped unexpectedly.#184WeiZhang555 merged 1 commit intocloud-hypervisor:masterfrom
WeiZhang555 merged 1 commit intocloud-hypervisor:masterfrom
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WeiZhang555
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read/write function invokes ``` self.check_fd_flags(data, f.as_raw_fd(), flags)?; ``` which takes ownership of `data` and it's inner `File`, after the function call returns, File will be dropped and cannot be read/write later anymore, causing a failed read/write. This bug is triggered when `no_open` config option is set, in this case, `self.get_data` opens a new file and it's dropped immediately after `check_fd_flags`. The bug can be solved by create a new clone of data by `data.clone()`, the original data(and inner File) can be kept in whole lifetime of read/write function. Signed-off-by: Wei Zhang <weizhang555.zw@gmail.com>
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eryugey
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Jan 25, 2024
bergwolf
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Jan 31, 2024
| assert!(!fs.cfg.writeback); | ||
| } | ||
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| impl ZeroCopyReader for File { |
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Why are these needed? The commit message does not seem to explain it.
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This resides in mod tests, at https://github.com/cloud-hypervisor/fuse-backend-rs/pull/184/files/9ca710da29796b759d6d782e8dd2d9209d5bf838#diff-7f83e7da9ae6f4daf23fadb16185e191349a8f96620bd58d29483e3b28ec1a1cR1593
I need a &mut dyn ZeroCopyReader, in fuse-backend-rs, I didn't find a convenient implementation of ZeroCopyReader and ZeroCopyWriter, so I have to implement one in mod tests for test usage.
bergwolf
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Feb 5, 2024
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read/write function invokes
which takes ownership of
dataand it's innerFile, after the function call returns, File will be dropped and cannot be read/write later anymore, causing a failed read/write.This bug is triggered when
no_openconfig option is set, in this case,self.get_dataopens a new file and it's dropped immediately aftercheck_fd_flags.The bug can be solved by create a new clone of data by
data.clone(), the original data(and inner File) can be kept in whole lifetime of read/write function.